Thread tool gauge



Aug 27, 1940. M. WALlCKl THREAD TOOL- GAUGE Filed Jan. 9, 19:59

. Patented Aug. 27, 1940 UNITED stares parent can a 2 Claims.

The present invention relates to machinists gauges and particularly to gauges used in the grinding of thread cutting tools.

The primary object of the invention is to provide a gauge for thread cutting tools having means for measuring the angle of the side of the tool, in combination with means for indicating and marking on a thread cutting tool, before it is ground, the proper depth to which the tool is to be ground for the depth of thread to be cut.

Another object is to provide a gauge for thread cutting tools-having a gauging notch for the reception of the end of a tool to be ground and gauge means providing a scribing edge adjustable in relation to said notch for marking on the tool the correct dimension of the flatfor the pitch thread for which the tool is to be ground.

Other objects and advantages of the inven- Y tion will be apparent from the following detailed description and upon reference to the accompanying drawing, wherein:

Fig. 1 is a top plan view of a preferred em Referring now more particularly to the de tails of construction of the gauge, It! indicates the body of the gauge which is in the form of a fiat metal plate of greater length than width. The gauge plate or body, H) has parallel side walls or edges H and i2 and is'tapered to a 40 point !3 at one end. The opposite end is pro-.

vided with a V-notch M.

Tool gauging notches l5 and it are formed in the sides of the body I0, one entering from each side, and are centered with respect to each other. The notch l5 has its walls disposed at 60 to each other for gauging a. tool for cutting a U. 8. standard thread having a pitch of 60". The other notch may be of different pitch to increase the utility of the gauge. 1

The body of the gauge is provided on one face with a. channel or groove [1 having straight parallel sides and extending laterally the entire width of the body of the gauge.- The central axis of the channel I! is the centerline of the 55 notches l5 and I6.

A sliding gauge 1bar l8, formed to accurately fit the channel H, is slidably disposed in the channel. The gauge bar [8 is of such a length as to extend to a position to overlie and partially cover the notch 85, or the notch it when inserted in the channel from the opposite end thereof. The end of the gauge bar i8 is formed as a straight scribing edge 19 extending at right angles to the centerline of the notches.

The face of the gauge bar It isprovided with graduations 20 which cooperate with graduations 2| on the face of the body It adjacent the edge of the channel II in determining the proper setting of the gauge bar for scribing a tool to be ground.

The gauge bar is held in position in the channel H by a spring arm 22 secured to the underface of the bar E8 in spaced relation thereto by means of an offset end 23 which is welded or otherwise secured to the underface of the bar H3 at the'end thereof opposite the scribing edge IS. A clamping set screw 25, having a knurled head 25, passes through an opening 26 in the spring arm 22 adjacent the offset end 23 and is threaded into the bar it for the purpose of drawing the spring arm into clamping engagement with the face of the gauge body H] opposite the chanis then tightened to clamp the gauge'body between the spring arm 22 and the bar l 8 so as to lock the bar against movement from the set position. The tool end is then inserted in the notch l5 and a scribing implement is run along the edge Hi to mark the line to which the point of the tool is to be ground off- In using the notch It, the slide is withdrawn and inserted from the other end of the channel. 7

While a preferred embodiment of the invention has been shown and described by way of illustration, it will be understood that modificatio-n of the details of construction of the" thereof, a channel formed on one face of said plate having a tool gauging notch in one side thereof, a channel formed on one face of said plate extending across said face in alinement With said notch, and a gauge vbar element slidably disposed in said channel having an end portion adapted to overlie a portion of said notch and having a scribing edge extending across said notch, and a spring arm carried by said bar adapted to engage the face of said plate opposite said channel. 1

MATHEW WALICKI. 

